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This study was carried out to reconstruct quantitative images in simultaneous 123I/99mTc SPECT. In the 123I/99mTc SPECT study the image reconstructed with the counts of primary photons emitted from the radionuclide with low photopeak energy (99mTc) is distorted by Compton scattered photons originating in the radionuclide with high photopeak energy (123I). To correct the scattered photons included in the low energy photopeak window in the simultaneous data acquisition, we proposed a method with a neural network at the 1999 IEE Medical Imaging Conference. In this paper we investigated the performance of our method with Monte Carlo simulations and phantom experiments with a brain phantom and a myocardial phantom. The results showed that our method could separate 99mTc and 123I with an error of about 4% The results promised to enable us to make clinical trials with dual radionuclides.